Sofa



FIG. 1 is a top perspective view of a sofa showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is a top perspective view of the sofa in an environment of use.

The broken lines in the drawings depict portions of the sofa that form no part of the claimed design. 

CLAIM The ornamental design for a sofa, as shown and described. 